<===> options.yml
---
:todo:
- libsass

<===> input.scss
:global(.thing) {
    color: red;
}

:global(.thing[disabled]) {
    @extend .thing;
    background: blue;
}
<===> error
Error: ":global(.thing[disabled])" failed to @extend ".thing".
       The selector ".thing" was not found.
       Use "@extend .thing !optional" if the extend should be able to fail.
        on line 6 of input.scss
  Use --trace for backtrace.

<===> error-dart-sass
Error: The target selector was not found.
Use "@extend .thing !optional" to avoid this error.
  ,
6 |     @extend .thing;
  |     ^^^^^^^^^^^^^^
  '
  input.scss 6:5  root stylesheet